A basilica beneath the earth, still alive

Among all the catacombs of Rome, the Catacombs of Domitilla hold a singular treasure: the Basilica of Saints Nereus and Achilleus, a semi-underground church built directly over the tombs of the two martyrs. It is the only catacomb basilica in Rome still in use for worship today: a place where early Christian history isn't just admired, but still lived as a space of devotion. Descending inside is an experience that stays with you.

Who were Nereus and Achilleus

According to tradition, Nereus and Achilleus were two soldiers (or servants in Domitilla's household) who converted to Christianity and were martyred for their faith in the early centuries. Buried here, they became the focus of deep veneration, so much so that a basilica was raised over their tombs. Their story is bound up with that of Flavia Domitilla, who gives the catacombs their name.

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The architecture: a church carved into history

The basilica was built at the end of the 4th century, over the burials of the martyrs and partly hewn out of the ground itself: that's why it's called semi-hypogeal (partially underground). Inside you'll find columns, fragments of decoration, and a famous small column depicting the martyrdom of Achilleus, one of the oldest representations of its kind. The setting, plain and solemn, captures the atmosphere of the earliest Christian churches.

What to look for

  • The semi-underground structure, unique among the catacombs of Rome.
  • The small column with the scene of Achilleus's martyrdom.
  • The remains of the decoration and the burials of the martyrs.
  • The apse and the layout of the early Christian basilica.

Frequently asked questions

What is the basilica of Nereus and Achilleus? A semi-underground basilica built at the end of the 4th century over the tombs of the martyrs Nereus and Achilleus, inside the Catacombs of Domitilla: the only catacomb basilica in Rome still in use for worship.

Who were Nereus and Achilleus? According to tradition, two soldiers (or servants tied to Domitilla's household) who converted to Christianity and were martyred for their faith in the early centuries.

Why is it unique? Because it's the only basilica built inside a Roman catacomb that is still in use for worship: a living place of devotion, not just a monument to visit.

What does "semi-hypogeal" mean? It means partially underground: the basilica was partly hewn out of the ground, above the tombs of the martyrs.

Can you visit it with the catacombs? Yes: the basilica is part of the guided tour route through the Catacombs of Domitilla.

See also

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Article #491 · Category: Monuments · Updated: May 2026